Category: Active noise canceling headphones 
<br />
<br />working voltage: 3.7V 
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<br />the maximum output power: 90MW 
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<br />the noise level :18-20db 
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<br />the signal to noise ratio (SNR):   90db 
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<br />power supply: 120mA lithium battery 
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<br />Rated operating time:> 20h 
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<br />noise reduction modes: dual microphone noise feedback 
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<br />Speaker diameter: 40mm
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<br />Speaker Impedance: 32 
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<br />speaker frequency response: 20Hz - 20KHz 
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<br />Speaker sensitivity: 115dB 
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<br />the noise level:   -78dBA 
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<br />the dynamic range:   78 dBA 
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<br />Distortion THD:   0.1% 
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<br />Stereo crosstalk:   -52 dBA 
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<br />cable length:  1.5M     
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<br />N/W: 175g
<br />G/W: 430g
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<br />Package Contents: 
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<br />1 x Active Noise Cancelling Headphone
<br />1 x aviation Aircraft Headphone plugs
<br />1 x Storage Bag
<br />1 x USB cable<p> <b><b><img src="https://contestimg.wish.com/api/webimage/5733eafc9f9eef5933b83327-large.jpg"><img src="https://contestimg.wish.com/api/webimage/5733eafc9f9eef5933b83327-1-large.jpg"><img src="https://contestimg.wish.com/api/webimage/5733eafc9f9eef5933b83327-2-large.jpg"><img src="https://contestimg.wish.com/api/webimage/5733eafc9f9eef5933b83327-3-large.jpg"><img src="https://contestimg.wish.com/api/webimage/5733eafc9f9eef5933b83327-4-large.jpg"><img src="https://contestimg.wish.com/api/webimage/5733eafc9f9eef5933b83327-5-large.jpg"><img src="https://contestimg.wish.com/api/webimage/5733eafc9f9eef5933b83327-6-large.jpg"><img src="https://contestimg.wish.com/api/webimage/5733eafc9f9eef5933b83327-7-large.jpg></b></b></p>